Remove support for windows

node_windows.go

@@ -1,23 +0,0 @@
-package restic
-
-import "os"
-
-func (node *Node) OpenForReading() (*os.File, error) {
-	return os.Open(node.path)
-}
-
-func (node *Node) fillExtra(path string, fi os.FileInfo) error {
-	return nil
-}
-
-func (node *Node) createDevAt(path string) error {
-	return nil
-}
-
-func (node *Node) createCharDevAt(path string) error {
-	return nil
-}
-
-func (node *Node) createFifoAt(path string) error {
-	return nil
-}